pkg/vm_service_client: add getSourceReport to VMServiceReference

test/client_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 
 import 'package:test/test.dart';
 import 'package:vm_service_client/vm_service_client.dart';
 import 'package:web_socket_channel/web_socket_channel.dart';
 
 import 'utils.dart';
 
 VMServiceClient client;
 
 void main() {
   tearDown(() {
     if (client != null) client.close();
   });
 
   test("returns the VM service version", () async {
     client = await runAndConnect();
     var version = await client.getVersion();
     expect(version.major, equals(3));
-    expect(version.minor, new isInstanceOf<int>());
+    expect(version.minor, greaterThanOrEqualTo(4));
   });
 
   test("considers the VM service version valid", () async {
     client = await runAndConnect();
     await client.validateVersion();
   });
 
   test("validateVersion() respects a custom timeout", () async {
     client = await runAndConnect();
     expect(client.validateVersion(timeout: Duration.ZERO),
@@ skipping 31 matching lines @@
     isolate = await isolate.loadRunnable();
     expect(isolate.pauseEvent, new isInstanceOf<VMPauseStartEvent>());
     expect(isolate.error, isNull);
   });
 
   test("with an invalid URL", () {
     var client = new VMServiceClient.connect("ws://example.org/not-a-ws");
     expect(client.done, throwsA(new isInstanceOf<WebSocketChannelException>()));
   });
 }